Architectural Principles for Enterprise Frameworks

Transcription

1 Architectural for Enterprise Frameworks Richard Martin Tinwisle Corporation Bloomington, Indiana Edward Robertson and John Springer Computer Science Department Indiana University Copyright 2004 by R. Martin, E. Robertson, and J. Springer

2 Architectural for Enterprise Frameworks Characterization General Framework 1

3 The Framework Audience Users of categorical comparison Partitioned dimensions and domains Intuitive and formal relationships Enterprise participants Stakeholders Model builders Model users Developers of modeling tools Research engineers and scientists 2

4 Our Framework Effort Formalism published in 1999 Presented to business and scientific community see EMMSAD 00 On-going assessment of applicability to published enterprise frameworks Continuing research activity - viewing Evolution of enterprise architecture 3

5 Our EMMSAD 04 Goals are Requirements Specification for formalization Seek your input on principles & approach Do they reflect your experience? Do they cover necessary aspects of architecture? Do they address the real enterprise-level issues? 4

6 Origins of International Standards ISO/CEN FDIS CIM Systems Integration: Framework for Enterprise Modelling ISO 15288:2002 Information Technology Life Cycle Management - System Life Cycle Processes Industrial & Governmental Models Zachman Framework for Enterprise Architecture C4ISR (United States Department of Defense) Professional Experience 5

7 ISO/CEN FDIS CIM Systems Integration: Framework for Enterprise Modelling enterprise model phase generic level domain identification concept definition requirements definition design specification implementation description domain operation decommission definition partial level genericity particular level function view information view resource view organization view enterprise modelling view 6

8 Process Hierarchy Enterprise Environment Mgmt System Life Cycle Processes Mgmt Investment Mgmt Resource Mgmt Quality Mgmt Project Planning Project Assessment Project Control Decision-making Risk Mgmt Configuration Mgmt Information Mgmt Stakeholder Requirements Definition Requirements Analysis Architectural Design Validation Transition Verification Integration Operation Maintenance Disposal Implementation 7

9 C4ISR Version 2.0 Architectural Views Systems View Processing and Inter-Nodal Levels of Information Exchange Requirements Systems Associations to Nodes, Activities, Needlines and Requirements Relates Capabilities and Characteristics to Operational Requirements Operational View Identifies Warfighter Relationships and Information Needs Specific Capabilities Identified to Satisfy Information-Exchange Levels and Other Operational Requirements Processing and Levels of Information Exchange Requirements Basic Technology Supportability and New Capabilities Technical Criteria Governing Interoperable Implementation/ Procurement of the Selected System Capabilities Technical View Prescribes Standards and Conventions Figure 2-2. Fundamental Linkages Among the Views Source: Architecture Working Group, C4ISR Architecture Framework Version 2.0,

10 Zachman Framework for Enterprise Architecture ENTERPRISE ARCHITECTURE - A FRAMEWORK TM DATA What FUNCTION How NETWORK Where PEOPLE Who When MOTIVATION Why T IM E SCOPE (CONTEXTUAL) List of Things Important to the Business List of Processes the Business Performs List of Locations in which the Business Operates List of Organizations Important to the Business List of Events Significant to the Business List of Business Goals/Strat SCOPE (CONTEXTUAL) Planner ENTITY = Class of Business Thing Function = Class of Business Process Node = Major Business Location People = Major Organizations Time = Major Business Event Ends/Means=Major Bus. Goal/ Critical Success Factor Planner ENTERPRISE MODEL (CONCEPTUAL) e.g. Semantic Model e.g. Business Process Model e.g. Logistics Network e.g. Work Flow Model e.g. Master Schedule e.g. Business Plan ENTERPRISE MODEL (CONCEPTUAL) Owner Ent = Business Entity Reln = Business Relationship Proc. = Business Process I/O = Business Resources Node = Business Location Link = Business Linkage People = Organization Unit Work = Work Product Time = Business Event Cycle = Business Cycle End = Business Objective Means = Business Strategy O w n er SYSTEM MODEL (LOGICAL) e.g. Logical Data Model e.g. "Application Architecture" e.g. "Distributed System Architecture" e.g. Human Interface Architecture e.g. Processing Structure e.g., Business Rule Model SYSTEM MODEL (LOGICAL) R o l e s Designer TECHNOLOGY MODEL (PHYSICAL) Builder DETAILED REPRESEN- TATIO NS (OUT-OF- CONTEXT) Sub- Contractor FUNCTIONING ENTERPRISE Ent = Data Entity Reln = D ata R elationship e.g. Physical Data Model Ent = Segment/Table/etc. Reln = Pointer/Key/etc. e.g. Data Definition Ent = Field Reln = Address e.g. DATA Proc.= Application Function I/O = User Views e.g. "System Design" Proc.= Computer Function I/O = Screen/D evice Form ats e.g. "Program" Proc.= Language Stmt I/O = Control Block e.g. FUNCTION Node = I/S Function (Processor, Storage, etc) Link = Line Characteristics e.g. "System Architecture" Node = Hardware/System Software Link = Line Specifications e.g. "Network Architecture" Node = Addresses Link = Protocols e.g. NETWORK Zachm an Institute for Fram ework A dvancem ent - (810) Interrogatives People = Role Work = Deliverable e.g. Presentation Architecture People = User Work = Screen Format e.g. Security Architecture People = Identity Work = Job e.g. ORGANIZATION Time = System Event Cycle = Processing Cycle e.g. Control Structure Time = Execute Cycle = Component Cycle e.g. Timing Definition Tim e = Interrupt Cycle = Machine Cycle e.g. SCHEDULE End = Structural Assertion Means =Action Assertion e.g. Rule Design End = Condition Means = Action e.g. Rule Specification End = Sub-condition Means = Step e.g. STRATEGY Designer TECHNOLOGY CONSTRAINED MODEL (PHYSICAL) B u ild er DETAILED REPRESEN- TAT IO N S (OUT-OF CONTEXT) S ub- Contractor FUNCTIONING ENTERPRISE Copyright - John A. Zachman, Zachman International (used with permission) 9

11 Professional Experiences Observing our practice Performing model integration Developing international standards Teaching software engineering Managing in enterprises Participating in workshops 10

12 Framework characteristics A containment structure organization and presentation context for model artifacts interconnections between models access to model components model fidelity and consistency NOT a programming framework. 11

13 General 1. Models are formal artifacts developed and used by people. 2. A complexity tradeoff exists between modeling medium and model instances in that medium. 3. Naming serves as the bridge between the formal and the human. 4. Separate model and instance decompositions do not confuse meta-levels. 5. Dependency is not chronology 6. Don t hide architecture in methodology. 12

14 Framework 7. Frameworks organize artifacts to facilitate understanding. 8. To improve quality, distinguish structure from connectivity. 9. Separate policy from mechanism. 10. Both grid (ordinant) and tree (decomposition) structures appear in models. 11. Scale dimensions include: abstractness (abstract to concrete), scope (general to special) and refinement (coarse to fine). 13

15 Framework 12. Within a framework, use of components are driven along one ordered dimension. 13. Along this ordered dimension, all prior context is relevant. 14. Refinement is recursive. 15. Connections can be of arbitrary arity. 16. Views are important in standards and methodologies. 17. Views are used both to see contents and to create contents. 18. Separate model and instance constraints. 14

16 Meta-confusion relationship entity subtype Concept space Relationship Entity IsA meta-model Model space Department works for Employee Party model / meta-data Data space Did DName 35 Accounting 95 Manufacturing Manufacturing Dept. Did Pid Pid PName 47 Joe Joe data/ instance World space real world thing 15

17 Distinguish structure from connectivity NY Div. Sales Procur. Manuf. Wrhse. Mrktng. Cntrcts Buyer Line 01 Shpng Rcving Inside Buyer Cell A Pkgng Outside Cell B Logistic Cell C 16

18 Two structural aspects Ordinant generic level partial level domain identification concept definition requirements definition design specification implementation description particular level function view information view resource view organization view domain operation decommission definition Decomposition 17

19 Three aspects of scale Abstractness, scope, and refinement Examples of dimensional independence: E-R diagrams are abstract but have rich refinement when fully populated Genericity contains constructs for use along a generalization gradient with a range of phase abstractions. Zachman interrogative proto-types are abstract with concrete model contents. C4ISR products span operational abstractions with technical refinement. 18

20 Scope dimensions abstract relationship entity subtype Concept space Relationship Entity IsA meta-model Model space abstraction Department works for Employee generalization special Party general model / meta-data Data space concrete Did DName 35 Accounting 95 Manufacturing Manufacturing Dept. Did Pid Pid PName 47 Joe Joe data/ instance World space real world thing 19

21 Purposeful dimension context Zachman: Role {Context, Owner, Designer, Builder, Out-of-context} ISO\CEN FDIS 19439: Model Phase {Domain, Concepts, Requirements, Design, Implementation, Operation, Decommission} ISO 15288: Process Group {Agreement, Enterprise, Project, Technical} C4ISR: Guidance {Focus, Scope, Characterize, Determine, Build, Use} 20

22 Recursive refinement cf. ISO Concept system Concept Development Production Utilization Support Retirement Development system Concept Development Production Utilization Support Retirement Production system Concept Development Production Utilization Support Retirement Support system Concept Development Production Utilization Support Retirement Retirement system Concept Development Production Utilization Support Retirement Concept Development Production Utilization Support Retirement System-of-Interest 21

23 Views are important For communication and analysis Examples: ISO\CEN FDIS 19439: View {Function, Information, Resource, Organization} C4ISR: View {Operational, Systems, Technical} C4ISR: Integration {National, Theater, CJTF, Tactical} A static collection of views is insufficient. ISO Amendment 1: Economic View 22

24 Toward Range Structure: both tree (decomposition) and grid (ordinant) frames and sub-frames Connections: between frame components respects purposive order Constraints: model and instance beyond structure and connection Views: generalizes view in existing frameworks defined on structure attempts to carry forward connections and constraints 23

25 Framework meta-meta model branch frames: F α IC α, OC α, SF α, Φ α leaf frames: F α IC α, OC α, S α Zachman specific Range where IC α OC α εoc α,r εic α,r SF α D D D restricted to row r : R x I x D F VF Φ α r {θ} R (εoc α,r xεic α,r ) Types D {SET OF d :d D} : D n ℵ Types n α S α 24

26 Toward Standardization Range ISO TC184 SC5 WG1 and CEN TC310 WG1 IS 14258, IS 15704, FDIS United States government Federal Enterprise Architecture Framework Enterprise Architecture Management Maturity Framework The Open Group Architecture Framework Academic & Commercial PERA, GERAM, ARIS, Metis, ZIFA 25